// Copyright 2020 The XLS Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#include <functional>
#include <thread>

namespace xls {

// Thin wrapper around std::thread to enable a uniform interface inside
// and outside Google (which, as one might imagine, has some custom
// functionality.
class Thread {
 public:
  Thread(std::function<void()> thread_fn)
      : thread_(thread_fn), joined_(false) {}
  ~Thread() {
    if (!joined_) {
      thread_.join();
    }
  }

  void Join() {
    thread_.join();
    joined_ = true;
  }

 private:
  std::thread thread_;
  bool joined_;
};

inline int AvailableCPUs() { return std::thread::hardware_concurrency(); }

}  // namespace xls
